126691629 has 4 divisors (see below), whose sum is σ = 168922176. Its totient is φ = 84461084.

The previous prime is 126691597. The next prime is 126691657. The reversal of 126691629 is 926196621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126691629 - 2⁵ = 126691597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126691129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21115269 + ... + 21115274.

It is an arithmetic number, because the mean of its divisors is an integer number (42230544).

Almost surely, 2^126691629 is an apocalyptic number.

It is an amenable number.

126691629 is a deficient number, since it is larger than the sum of its proper divisors (42230547).

126691629 is an equidigital number, since it uses as much as digits as its factorization.

126691629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42230546.

The product of its digits is 69984, while the sum is 42.

The square root of 126691629 is about 11255.7376035514. The cubic root of 126691629 is about 502.2454065376.

The spelling of 126691629 in words is "one hundred twenty-six million, six hundred ninety-one thousand, six hundred twenty-nine".